feat: 增强API Keys Excel导出功能和样式美化

- 添加输入/输出Token列到Excel导出
- 使用xlsx-js-style库实现专业的Excel样式
  - 彩色表头（蓝色/绿色区分）
  - 交替行背景色
  - 正确的列对齐（日期右对齐，名称左对齐）
  - 费用列特殊样式（蓝色加粗）
- 简化导出内容，仅包含用量数据
- Token数量使用K/M单位格式化
- 模型统计也包含输入/输出Token

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/admin-spa/package-lock.json

@@ -16,7 +16,8 @@
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